BOOKS: Loads of venues around London are taking part in the Children’s Book Swap. Have a look at the World Book Day website for more information.

COMEDY: When we saw Max & Ivan: Are Con Artists a few months ago we described them as “too good for human words” and “magnificent unicorns of comedy”. You absolutely have to see it at Leicester Square Theatre as the duo round up a week-long takeover. Tickets £10, starts 7pm.

CHOIRS: Southwark Community Choir, Koruso! sings with fellow choir from Southwark's twin town of Langenhagen, Germany in a special concert at St Peter's, Walworth. Tickets £5 advance, £6 on the door, starts 7pm.

POEMS: John Hegley’s performing his Adventures of Monsieur Robinet show as part of the Southbank Centre‘s Imagine Children’s Festival, but it’s also very suitable for adults. Tickets £8 adults, £4 under 16s, starts 11am.

VINTAGE:Clerkenwell Vintage Fashion Fair opens its doors for top vintage shopping, styling and homeware at beautiful Old Finsbury Town Hall, Rosebery Avenue. Entry is £4, from 11am-5pm.

BUSES: Watch out for vintage buses touring the now W3 and W7 routes around Finsbury Park, Alexandra Palace and Muswell Hill from about 11.30am.

THE BILL: Did you love the TV series about the Met? You can go on the Official Bill Tour of Wimbledon Studios today. Adults £35, family of four £85, apply online, tours at 12 and 2pm.

SPIT: If you are aged 16-30 (and weigh over 8 stone) go along to the spit clinic at East Finchley Library being run by Anthony Nolan to join the bone marrow donor register and potentially save a life. Free tea and cake! Free, just turn up between 11.30am-2.30 pm.

LGBT HISTORY:Hither Green Cinema presents The Celluloid Closet, a documentary showing how Hollywood has both reflected and defined how we think about homosexuality. Plus a fair before the screening with local LGBT groups. From 5pm (free), Tickets for film £5, screens from 6.30pm.

FAIRYTALES:Vila’s Mountain, a show of Serbian fairy tales for adults, starts a run at the Playhouse at Cable Street Studios, E1. Tickets £5 advance, £7 on the door, starts 7.30pm.